Koronal sütür sinostozu

Özet

Koronal sütürün erken kemikleşmesi tek taraflı olduğunda ön plagiosefali, iki taraflı olduğunda kısa ve geniş kafa biçimi oluşturur. BT, sütür hattındaki kemik köprüsünü ve buna eşlik eden frontal, orbital ve sfenoid şekil değişikliğini birlikte göstererek tanıyı ve tutulum haritasını netleştirir. Bebeklerde iyonizan radyasyon riski nedeniyle BT, yalnızca gerekli klinik soruları yanıtlamak için ve düşük doz protokolü uygulanarak kullanılır; sütürlerin değerlendirilmesinde yaşa bağlı normal kapanma dönemleri referans alınır. Çoklu sütür tutulumu genellikle sendromiktir ve ek yapısal ve işlevsel komplikasyonlarla birliktedir.

Faz ve pencere

Kontrastsız tanısal

İnce kesitli kemik penceresinde frontal-parietal sınırdaki koronal sütürün kesintisiz kemikleşmesi, sütür çizgisinin silinmesi veya kemik köprüsü; tek taraflı olguda aynı tarafta sığ ön kraniyal fossa ve yükselmiş orbital çatı seçilir. İyotlu kontrast tanı için gerekli değildir.

Önerilen pencereler: Kemik (G 1800 / M 400).

BT bulguları

• Koronal sütür boyunca serrasyonlu radyolüsent hattın kaybı ve frontal-parietal kemik arasında kemik köprüleşmesi
• Tek taraflı sinostozda aynı tarafta basık frontal kemik ve sığ ön kraniyal fossa seçilir.
• Karşı frontal kemikte telafi edici kabarıklık; üstten görünümde oblik ön kafa konturu
• İpsilateral orbital çatının ve süperolateral orbital kenarın yükselmesi (harlequin orbit görünümü)
• İpsilateral sfenoid kanadının yükselmesi, karşıya kaymış anterior fontanel ve yüz asimetrisi izlenir.
• İki taraflı sinostozda kısalmış ön-arka kafa çapı, genişlemiş bipariyetal kontur ve iki taraflı orbital çatı yükselmesi
• Sagittal, metopik ve lambdoid gibi diğer sütürlerin tutulum durumları ve kombinasyon paternleri değerlendirilir.

Normalde

Aynı yaş grubundaki normal ince kesitli kemik BT'de koronal sütür frontal ve parietal kemikler arasında ince, kıvrımlı ve radyolüsent bir çizgi olarak izlenir; bebeklik döneminde açıklık ve serrasyonlar beklenir. Sağ ve sol orbital çatıların yüksekliğini, ön kraniyal fossaların derinliğini ve frontal kemik konturunu karşılaştır; tek taraflı sinostoz bu simetriyi bozar.

Ayırıcı tanı

Pozisyonel (postüral) deformitede sütürler açıktır; kemik füzyonu bulunmaz.

Metopik sinostoz

orta hatta metopik sütür kapanması ve üçgensi alın vardır; koronal sütürler açık olabilir.

Bilateral koronal sinostoz

tek taraflı obliklikten çok kısa- geniş kafa ve iki taraflı orbital deformite yapar.

Kranial sütür varyantı veya aksesuar sütür

beklenen anatomik seyirde ince çizgi halinde devam eder ve eşlik eden kompansatuvar kafa biçimi yoktur.

Tuzaklar

• Tek bir kesitte sütürün seçilememesi füzyon kanıtı değildir; ince kesitleri ve çok düzlemli kemik rekonstrüksiyonlarını sütür boyunca izleyin.
• Koronal sütürün erken çocukluk öncesinde fizyolojik kapanması beklenmez; değerlendirme yalnızca çizgi görünürlüğüne değil, kemik köprüsü ve kafa/orbit şekline dayanmalıdır.
• Kafa tabanı asimetrisi ve kısmi sütür tutulumu üç boyutlu yüzey görüntüsünde gözden kaçabilir; aksiyel-koronal kesitlerde sfenoid kanatları ve orbital çatıları da inceleyin.

Kendini dene

1. Bebekte sağ koronal sütür kemik köprüsüyle kapanmış; sağ orbital çatı yüksek, sol frontal kemik bombeli. En olası tanı nedir?

   • Sağ koronal sinostoz
   • Pozisyonel plagiosefali
   • Metopik sinostoz
   • Lambdoid sinostoz
   Cevabı göster

   Sağ koronal sinostoz. Koronal sütür füzyonuna aynı tarafta sığ ön fossa ve yükselmiş orbital çatı, karşı tarafta frontal kemik kabarıklığı eşlik eder. Pozisyonel plagiosefalide sütür açık ve tipik orbital çatı yükselmesi yoktur; metopik ve lambdoid tutulum farklı sütür ve kafa bölgelerini etkiler.

2. İki koronal sütürde de sinostoz var; kafa ön-arka yönde kısa ve iki orbital çatı yükselmiş. Hangi patern beklenir?

   • Bikoronal sinostoz
   • Sagittal sinostoz
   • İzole metopik ridge
   • Pozisyonel deformite
   Cevabı göster

   Bikoronal sinostoz. İki taraflı koronal füzyon ön-arka büyümeyi kısıtlayarak kısa-geniş kafa ve bilateral orbital deformite oluşturur. Sagittal sinostoz uzun-dar kafa yapar; metopik ridge orta hat bulgusudur ve pozisyonel deformitede sütürler açıktır.

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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